Sewing-machine.



M. T. DENNE.

SEWING MACHINE.

APPLICATION mm SEPT. 22, 1914.

1 1 98AZ4. Patented Sept. 19, 1916.

WiTnesses. Inventor. d. WM Mark Thomas Denne.

UNITED STATES PATENT OFFICE.

MARK THOMAS DENNE, OF RUSHDEN, ENGLAND.

SEWING-MACHINE.

To all whom it may concern:

Be it known that I, MARK THOMAS DENNE, a subject of the King of Great Britain and Ireland, residing at Rushden, Northamptonshire, England, have invented new and useful Improvements in and Relating to Sewing-Machines, of which the following is a specification.

This invention has reference to improvements in and relating to sewing machines and it consists in an improved feed mechanism intended more especially for use in welt sewing machines, its objects being to simplify the construction of the feed mechanism and to enable any desired amount of work feed movement within'a wide range to be obtained with but slight adjustments to be made by the operator.

I have illustrated my invention in the accompanying drawing, in which Figure 1 is a side elevation of my improved feed mechanism. Fig. 2 is a front view thereof, and Fig. 3 shows a detail hereinafter referred to.

In the said drawing, 1 indicates the usual cam shaft of a welt sewing machine. The cam cylinder 2 from which the feed shaft is actuated is shown in dot-and-dash lines.

3 is the feed shaft journaled in the frame of the machine (a portion of which frame is shown in section), the said shaft being mounted in front of the cam cylinder in a plane at right angles to the axis of the cam shaft. 4 is a lever or crank secured on the rear end of the said feed shaft and carrying a cam roll 5 which is engaged in a suitable groove 6 formed in the periphery of the cam cylinder 2. A slotted crank 7, shown separately in Fig. 3, is secured upon the front end of the shaft 3 and in the slot of this crank a block 8 pivotally carried by a stud 9 is slidably mounted. The stud 9 passes through a vertical slot 30 in the feed slide 10 which is slidably carried in guides 11 mounted on the frame of the machine in front of the crank 7, and the said stud is clamped in the desired position in the said slot by means of a nut or the like. When the cam cylinder 2 rotates the crank 4 is caused to oscillate and thus rock the shaft 3, and the rocln'ng movement of this shaft is transferred into a reciprocating movement Specification of Letters Patent.

Patented Sept. 19, 1916.

Application filed September 22, 1914. Serial No. 863,021.

of the feed slide 10 by means of the crank 7, block 8 and stud 9.

By setting the stud 9 and, with it, the block 8 nearer to or farther from the axis about which the crank 7 oscillates, the extent of the reciprocating movement imparted at each oscillation of the crank to the feed slide will be made less or greater, and consequently the feed stroke of the awl, which moves laterally with the feed slide, will be made shorter or longer as may be required.

In the construction illustrated the curved aw]. employed oscillates around the pivot 13 which is carried by a plate 12 that is bolted to a flange of the feed slide 10, the path of oscillation of the awl'being indicated by the dot-and-dash are 14;. The path of movement of the curved needle employed is inclicated by the dot-and-dash circle 15.

WVhat I claim as my invention and desire to secure by Letters Patent is In a sewing machine having an awl by means of which the work is fed, feed mechanism consisting in combination of a cam cylinder mounted on the usual cam shaft, a feed shaft mounted in the frame of the machine in front of the cam cylinder with its axis in a plane at right angles to the axis of the cam shaft, a crank arm secured on the rear end of the said feed shaft and carrying a cam roll that engages in a suitable groove in the cam cylinder so that when the cam shaft rotates the feed shaft is caused to rock in its bearing, a radially slotted crank arm secured on the front end of the said feed shaft, a block which is engaged slidably in the said slot and is carried pivotally by a stud or bolt, and a horizontally slidable feed slide that carries the awl and is formed with a vertical slot in which the said stud is adjustably secured so that the block on the said stud may be adjusted in its slot nearer to or farther from the axis of the feed shaft to vary the extent of movement of the feed slide as may be required.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MARK THOMAS DENNE.

Witnesses:

A. E. WILLIAMS, M. POLLON.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of latelts, Washington, D. G. 

